Die-stock.



H. W. OSTER.

DIE STOCK. APPLIOATIONTILED MAY 14,'109.

Patented Dec. 27, 1910.

2 SHEETS-SHEET 1.

H. W. OSTER.

DIE STOCK.

4 APPLICATION FILED MAY 14,1909.

Patented Dec. 27, 1910.

2 Sums-sum 2.

- onrr A'rnn'r HERMAN W. OSTER, OF CLEVELAND, OHIO, ASSIGNOR TO THE OSTER MANUFACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION' OHIO.

DIE-STOCK.

Specification of Letters Patent.

Patented Dec. 27, 1910.

Application filed May 14, 1909. Serial No. 495,890.

To all whom it may concern:

Be it known that I, HERMAN W. Os'rnn, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Die-Stocks, of which the following is a full, clear, and exact description.

The object of this invention is to provide a die stock adapted to be easily adjusted for cutting threads on pipes or other cylindrical bodies of diflerent diameters, and tapering the threads which it cuts, and to be quickly disengaged froin the work when the cutting of the threads has been completed. 1

The invention consists primarily in the employment of a bar which extends across 1 the tubular center of the die stockbody so as to be struck and moved relatively to said body by the end of the work which is being threaded, and. means wherebysaid bar, when so moved, will throw a train of mechanism, substantially as shown, and compel the outward recession of said dies. 1

The invention also includes some minor features of novelty, among which may be specified theplacement eccentrically on the bar which controls the position of a cam plate of a head, with the surface of said head on one sidethereof formed as a continuation of the corresponding surface of the bar.

A die stock embodying the invention is shown in the drawing and is hereinafter fully described both as to construction and mode of operation, and the novel combinations of parts constituting the invention are definitely set forth in the appended claims.

In the drawing, Figure 1 is a frontend view of a die stock embod ing the invention:

Fig. 2 is a side elevation t ereof. Fig.3 is a longitudinal sectional view in the plane in-' dicated by line 33 on F ig. 1. Fig. 4 is a fragmentary section on line 4- on Fig. 2. Fig. 5 is a fragmentary sectional view in the plane on line 5-5 on Fig. 2.

Referring to the parts by letters, A represents the body of the die stock. Y

B, B, represent the radially movable dies mounted in guideways in the head or enlarged front end of said body.

C represents a cam plate, rotatably mounted on the end of the body, and having the usual scrolls, indicated by dotted lines in Fig. 1, for engagement with the dies to move them radially inward or outward.

said dies. v the radially movable guide barsH operated to center the die s'toek on the work.

D represents a cap secured to the front end of the body and serving primarily to .hold the cam plate on the body. The body has a rearward cylindrical extension (1, through which two diametrically opposed longitudinal slots at, 0;" are formed, which slots extend as grooves to the front end of the body in the enlarged end or head a thereof, and through'the cap D. Embracthereon,- beingprevented by the. parts 9 in the grooves a. On this ring is a laterally extended wing e in which is an arc-shaped slot 6. An inclined bar J passes'through but is non-rotatable in this slot, and. is capable of being inoved along the slot to any desired position; and it may be clamped to.

the ring E in any position by means of the clamping nut K having the handle 70. The front end of this rod passes'through a hole in the laterally extended ear 0 of the cam .pl'ate C, It is obvious that if the ring be moved longitudinally upon the body,. t his rod-will, because of its inclination, turn the cam plate irf'one direction or the other, d epending upon the direction which .said' ring is moved. When the ring is moved toward the front end of. the head the cam plate will'be turned in that direction which causes the outward or receding movement of At the rear end ofthe headare by a cam plate I of familiar form. .There is nothing novel at this end "of the die stock and any of the well known guide devices employed in die stocks may be used in place of those shown.

.In using the, diestock it is placed on the work. The guide bars H are moved so las T 1e clampin nut K is loosened, and the cam plate C is then turned so as to bring the dies in roper position to out the thread upon sai work. The ring E at this time has been moved rearward on the body, and preferab ly against the. shoulder a thereon. After a suitable length of the thread has been cut, during the cutting of which the die stockwill advance upon the work, the bar G will come into contact with the end of the work. As the die stock now continues to turnand advance this bar cannot advance with it and, therefore, since it is connected with the rin E, said ring will move relatively forwar upon the die stock body. This will cause the inclined bar J to more through the hole in the ear of the. cam plate and this will cause the cam plate to turn in the direction indicated by the arrow indFig. 1, and this will cause the dies to rece e.

It will be noted that the front end of the inclined bar J is enlarged, the enlargement or head 7' being set eceentrically on the end of said bar, so that the surface of said' head and the surface of the bar on one side of 4 the latter are alined. When this bar moved by ring E is moved far enough, the enlarged head .j will have passed through the hole in the cam plate ear, and therefore the cam plate may now be turned a distance suf ficient to entirely withdraw the dies from I the work. To restore the parts to the starting point and particularly to enable the ring E to move back against the shoulder a the cam plate is turned until one sideof the hole in its ear engages with that side of the bar J which is alined with the corresponding side of the head 3'. This being done, the ring E may be pushed backward and the head j will sli smoothly into and through the hole in saicl cam plate ear.

The return of the parts totheir normal positions ,as described may be facilitated, and the parts may be .held in such position while the device is being handled, by a sprin or springs, as, for example, contractile coil springs M, In the construction shown one end of each spring .is attached to the rear end of the die stock body. In the construction shown the rear ends of, the springs-are attached to the body ,by means of screws 'P which are primarily provided for connecting two partsof the body together. The front ends of the spring pass through the ring and engage pins N which are fixed to the ring.

Having described my invention, I claim: 1. In a die stock, the'combination of a body having a head and cylindrical portion behind said h ead, there being through said cylindrical portion two diametrical y opposed longitudinal slots which are extended as grooves iii the head part of said body to the front end thereof, radially movable dies mounted in the end of said head, and a cam plate rotatably mounted on said head and engagin .said dies (and having a laterally extender perforated ear, the ring embracing the cylindrical part of said body, an inclined bar connected therewith and extended through said perforated ear, and a bar extending across the tubular center of. said body and having rearwardly extended members which pass through said longitudinal slots and are fixed to said ring.

2.- In a die stock, the combination of a body, radially movable dies carried thereby, a cam plate mounted on the body and engaging said dies and having a laterally extended perforated ear, a ring longitudinally movable upon said body, means preventing its rotation, and an inclined bar fixed to said ring and extended through said perforated ear, said bar having at its front end an enlarged head offset to one side of said bar so that atthe opposite side the external sur:

faces of said head and bar are in the same plane, and a bar fixed to said ring and extended across the tubular center of the body.

3; In a die stock, the combination of a body having a longitudinal slot, radially movable dies mounted on saidbody, a rotatable cam plate mounted on the body and engaging said dies to move them, a ring movable longitudinally. on said body and having an inclined surface engaging with a part of said cam plate, a bar extending across the tubular center of said body. and through the slot therein and being connected with said ring, and a spring connected with the ring and body and exerting its force to drawthe ring rearward on the body.

In testimonywhereof, I hereunto afiix my signaturein the presence of two Witnesses.

K HERMAN w. 'OSTER. 

